Improvement in saw-mills



W. DEAN SMITH AND ANDREW J. CHASE, 0F UNIONQNEW YORILfH LettersvraentNo. 113,217, dated Marches, 1871.

The Schedule referred to in these Letters Patent and making part of thesame.

To all whom it may concern:

Be it known that we, W. DEAN SMITH and AN- DREW J. CHASE, both of Union,county of Broome and State of New York, have invented certain new anduseful Improvements in Saw-Mills, of which the following is a full,cleaigand exact description, reference being had tothe-accompanyingdrawing making a part of this specification, iu which- I Figure l is aperspective view of the improved devices;

Figure 2, an end elevation, partly in section; and

Figures 3, 4, 5, and 6 are detached views, showing some ofthe parts indiierent positions.

The first part'of the invention relates tothat class of saw-mills inwhich the knees which feed the log orv 10g-cant laterally forward uponthe head-block are `actuated by means of pinions which engage withtoothed racks upon the under side of said knees, the construction andarrangement of devices being usually such' that both ends of the log arecarried forward simultaneously.

This part of the invention consists in a novel construction andcombination of devices whereby a single pinion, which is drivencontinuously Yin one direction, is made to move the knees either forwardor backward such distances and at such times as may be desired by theoperatonboth the direction and the distance traveled by said knees beingindicated upon'a 'disk or dial-plate so `located as to be readily seenby the attendant.

The second part of the invention consists in slotting the side pieces orstri'ngers of the carriage upon which the head-blocks rest, andconnecting said head-blocks (one or both) with the carriage, by means ofa tongue or tenon, which Vis framed into the slot, in a manner whichwill be hereinafter described, so that the head-V blocks may be readilyadjusted to receivelogs of different lengths.

In the drawing- A represents the door of the mill;

B B are posts; and

C C, girts forming' a frame-work, upon which are mounted various partsof the mechanism.

D is a side piece or stringer of the carriage. 'lhere may be, ifpreferred, two of these stringers, one upon each side.

These stringers may be connected by forming a carriage, upon which thehead-blocks are supported.

The head-block is composed of bed-pieces E E, girts El, and ways Ez, inwhich .the knees `.E3 slide freely, as will be readily understood fromthe drawing with out further explanation.

Each Stringer is slotted, as at d, figs. 1 and 3, and

girts, thus the girts Earetenoned so as to pass through and move freelyin said slot.

The girt El is shouldered, as at e e, iig. 3, the outer end of the tenonbeing confined in bed-piece E, there by locking the head-block securelyto the carriage, and yet permitting it to slide longitudinally thereonwhen required.

F is a gear-wheel, mounted on a shaft, F', (shown Yin iig. 3,) whichruns lengthwise of the carriage below g the head-block.

This shaft drives two spur-pinions, G, one ot`- which is mounted in andtravelsfwith each of the headblocks, a'hd is connected, 4by. means oftransmittingpinion G-l, witha toothed rack, G2, secured to the lowerside of the knee. `\j

Piuions G are mounted loosely upon shaft F'; that is, they can slidelengthwise of the shaft with the head-blocks, but they are keyed orfeathered toit, (the shaft,) so as to revolve with it. Thus a rotarymovement of wheel I` imparts a reciprocating motion to the knee, as willbe readily seen,

H is a hollowshaft, mounted in a vertical position in theframe-work, sothat it can slide' up and down freely. It rests at the bottom in asuitable step on one cud of -a lever, I, located below the door A and.pivoted at I1.

The opposite end of this lever is actuated by a pin, I, or itsequivalent, which passes lthrough the door, and also by another lever,which will presently be described.

Ia is a slotted or forked guideblock, attached to the door near that endof lever" I which supports shaft H, and serving to prevent any lateralmotion of the lever and of the bottom ofthe shaft.

J is a bell-crank, pivoted to lever I at t'.

J is a locking-plate or stop, made preferably of metal', and secured tothe lower end of the guideblock I.

K is a tripping-rod, located within the-hollow shaft i H, and connectedwith the horizontal arm of bellcrank J.

K' is a disk secured to the upper end of tripping` .rod K.

The upper end of tubular shaft H is with a coarse right-handscrewfthread.

H1 is a toothed nut, the thread of which corresponds to that upon shaftH, so that, by turning it (the nut) around, it may be moved up or downupon the shaft, in a manner and for the purpose which will behereinafter explained.

'H2 is a spur-wheeLkeyedto the upper end of shaft H. y

Fig. 6 represents a'tripper, composed of a collar, L, from whichrisefour stems, l. v

providedvr I, the tripping-rod K, bell-crank J, stop J f, disk K', andnut H1.

4. The combination of vibrating arm O1, shafts O P', gears I O, and nutH, substantially as described. y 5. The combination of shafts OVP, gearsP O1 O O3 HZ with nut H1, tripper L l, and shaft H, as set forth.

6. The slotted side piece or Stringer D, in com# biuation with thetenoned girts E1, bed-piece E, and

ways E2, these parts being constructed and arranged substantially asdescribed, whereby the head-block may be adjusted longitudinally uponthe carriage, as

set forth W. DEAN SMITH.

ANDREW J. CHASE.

Witnesses:

E. R. SHEPARD,

L. D. WITHERILL.

